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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b58aa5c5b1d7687f3ad3c143fd4dc7081e41a7868f949bfe002aad7614426b' 
  AND token = 'ny/q/6xO9HPyh8qXcclLZo37kwHahDM+wOOfCotK7Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}